Waterproof paint



STATES PATENT OF ICE,

srrmeo xtmoxr, or TOKYO, .mrm.

l wa'rEarnoor PAINT.

1,333,321; '10 Drawing.

T 0 whom it may concern Be it known that I, Smxco KUROKI, a

subject of the Emperor of Japan, and a resident of No. 14 Roppongi-Chm Azabu- Ku, city of Tokyo, Empire of Japan, have invented new and useful Improvements in Waterproof Paint,- of which the following is a specification.

- This invention relates to improvements in the manufacture of insoluble paint, 'such as are employed for preserving and waterproofing marine gear, such as fishing nets,-

ropes and the like, and for analogous uses,

the object of the invention bein to produce j a paint of this kind which is c eap, which may be readily worked, and-which possesses water resisting qualities to a-high degree.

'mented until it is transform which is capable of bein According to this invention luten is fered into a viscoidal liquid which is readily miscible with either water or oil. Camphor oil is mixed therewith to prevent excess fermentation and formalin added torender the same insoluble, as hereinafter described and claimed. In carrying out my improved process I mix wheat flour with water in the proportion approximately of eight and one-half pounds of the flour to two thousand gram of water and carefully knead the same for about two hours to convertthe same into a sticky mass. The mass is then washed re peatedly in a suitable vessel until all of the soluble starch matters are. carried off with the water. The residue is a pure insoluble gluten. The gluten thus obtained is then placed in a suitable warming chamber having a temperature preferably from 75 to 80 F. and is permitted to remain there from five to seven days until the entire mass is converted by gradual fermentation into a viscoidal liquid of brownish appearance and readily. mixed with either water or oil. 0 this brownish viscoidal liquid I then add camphoroil in the roportion of one thousand grams of the liquid to two hundred grams of the oil. This produces the base of my paint. To this base paint I then add formalin to make the same insoluble in water and in the proportions of-about one'thousand grams of the formalin.

- I Specification of Letters latcnt.

When .it is desirable that the finished product shall be dried" and colored, I add to the brownish viscoidal liquid white clay Patented Mar. 9,1920;

Application fled Kay 6, 1919. Serial No. 295,125.

and the necessary ,pigment, preferably in the proportion of one pound and one and one-half pdunds respectively, which is then dried and groundto powder. 1

Originally the gluten obtained from wheat flour somewhat resembles soft rubber and is absolutely insoluble and entirely wash proof evenin iodin water. However, itis transformed into a sticky liquid after having undergone the fermenting operation herelnbefore set forth, although at this stage of the operation it is not yet suitable for use in a paint.

According to thisinvention, this fermenting operation is continued until the entire mass of gluten is converted into a brownish liquid to such an extent as to be. readily miscible with water and oil and so that the same may be readily worked either by diluting or concentrating it according to the nature of the paint to be produced. My invention further contemplates the use of camphor oil to prevent excess fermentation. ,The camphor oil besides check-, ing the fermentation gives the finished product a glassy appearance. Moreover, the use of camphor oil increases the water resisting and antiseptic qualities of my paint and causesthe same to greatly increase the durability of the material painted therewith.

The addition of the formalin to the base paint renders the product positively insoluble in water and even to repeated washing in hot water.

paint consisting m transforming gluten by fermentation into a viscoidal liquid which is readily miscible with either Water or oil, mixing camphor oil therewith to prevent excess fermentation and adding formalin thereto to render the same insoluble.

In testimony whereof I aflix my signature in presence of two witnesses.

' SHINGO KUROKI.

Witnesses:

H. YASUMURA,

M. Orsm. 

